The effect of Ce content on the microstructure and corrosion behavior of 434 ferritic stainless steel
The effects of different Ce contents on the microstructure,passivation film,and corrosion behavior of SUS434 ferritic stainless steel alloy were systematically studied through electrochemical testing and microstructure characterization.The research results indicate that with the increase of Ce content,the grain size of SUS434 ferritic stainless steel is significantly refined,and its corrosion resistance can be improved by improving the protection of the passivation film layer.When 434 ferritic stainless steel contains high Ce content,the sensitization degree of the sample is relatively low,and the soaked sample exhibits excellent resistance to intergranular corrosion.This is mainly because when the Ce content is low,the grain size is larger.Generally speaking,the larger the grain size,the larger the grain boundary area of stainless steel,which to some extent increases the possibility of corrosion battery formation.In addition,large grains typically contain more inclusions and precipitates,which can also accelerate the corrosion process.
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